The Lantac USA Ultra Smooth Safety Plunger and Reduced Power Spring is a quick and affordable way to improve your Glock 17 or 19 trigger pull. It is machined from 17-4PH stainless steel and domed surface reduces friction with the trigger bar and helps to smooth out the trigger pull. Compatible with most 9mm, .40 S&W, .357 Sig, 10mm, and .45 GAP pistols.Features: Machined from 17-4PH stainless steel Domed surface Includes reduced power spring Compatible with most Glocks Manufactured in the U.S.A.Lantac USA manufactures the highest quality accessories for AR-15/M16 pattern rifles. Precision made in the U.S.A., rifles, muzzle brakes and more. DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.